Code Beautifier
Format and beautify HTML, CSS, JavaScript code
Source code & formatting
Formatting runs in your browser. Your code stays on this device.
JSON formatting also validates the document.
Python preserves existing indentation and normalizes blank lines.
SQL formatting keeps quoted values and comments intact.
Formatted code
Paste code or load a sample to format it.
Free Online Code Beautifier & Formatter
Our code beautifier transforms minified, compressed, or poorly formatted code into clean, readable, and properly indented output. Paste a single-line JavaScript bundle from production or a collapsed HTML template from a CMS export, and this online code formatter restructures your code instantly so you can read, debug, and maintain it with ease.
Supporting ten popular languages -- JavaScript, TypeScript, HTML, CSS, JSON, XML, SQL, Python, Java, and PHP -- the tool applies language-aware formatting rules. JSON beautification also validates syntax, catching errors before they reach production. CSS and HTML formatters handle nested selectors and tag hierarchies, while the general-purpose engine correctly indents brace-delimited languages like Java and PHP.
Your source code is never uploaded and never leaves your device, making this code prettifier safe for proprietary projects, internal APIs, and sensitive data. Customize indentation style (spaces or tabs) and size (2, 4, or 8) to match your team's coding standards, then copy or download the result in one click.
Key Features
- Support for 10 languages: JavaScript, TypeScript, HTML, CSS, JSON, XML, SQL, Python, Java, and PHP
- Real-time beautification that formats code as you type
- Customizable indentation with spaces (2, 4, or 8) or tabs
- Built-in JSON syntax validation during formatting
- HTML and XML hierarchical tag indentation
- CSS selector and property block formatting
- SQL keyword capitalization and clause separation
- One-click copy to clipboard and file download with correct extension
- Character count statistics for original and beautified code
- Preloaded sample code for quick demonstrations
How to Use the Code Beautifier
- Select a language: Choose the programming language from the dropdown so the formatter applies the correct rules.
- Set indentation preferences: Pick spaces or tabs, then select the indent size that matches your project's style guide.
- Paste your code: Enter or paste your minified or unformatted code into the input area. Formatting starts automatically.
- Review the output: The beautified code appears in the right panel with proper indentation and structure.
- Copy or download: Click "Copy" to place the result on your clipboard, or "Download" to save a file with the appropriate extension.
Use Cases
- Debugging minified production code: Expand compressed JavaScript or CSS bundles to locate bugs faster.
- Code reviews: Reformat pull request snippets so reviewers can follow logic without squinting at dense one-liners.
- Learning and teaching: Students can see proper indentation patterns for any supported language.
- Standardizing team style: Quickly reformat legacy files to match updated coding conventions.
- API response inspection: Beautify JSON payloads returned from REST endpoints for easier analysis.
- Database query cleanup: Format SQL queries with proper keyword alignment before sharing with your DBA.
- Web template organization: Indent nested HTML and XML structures so templates are easier to maintain.
- Documentation preparation: Present clean, formatted code snippets in technical documentation or blog posts.
Frequently Asked Questions
Does the beautifier change my code logic?
No. The tool only adjusts whitespace, indentation, and line breaks. It does not modify variable names, reorder statements, or alter your code's functionality in any way.
What happens if my JSON is invalid?
When you select JSON as the language, the beautifier validates the syntax during formatting. If the JSON is malformed, the output area will remain empty, alerting you to a parsing error so you can fix it.
Can I use tabs instead of spaces?
Yes. Switch the indent type to "Tabs" in the settings panel. When tabs are selected, the indent size selector is disabled because tab width is determined by your editor or viewer.
Tips & Best Practices
- Match your project's style guide: Set the indent type and size before pasting code so the output is ready to commit.
- Use the sample loader: Click "Load Sample" to see how each language formats before pasting your own code.
- Validate JSON first: Select the JSON language mode to catch syntax errors while beautifying API responses.
- Check character counts: Compare original and beautified character counts to understand how much whitespace was added.
- Download for large files: For lengthy formatted output, use the "Download" button to save a properly named file instead of copying.
- Combine with diff checking: Beautify two versions of a file, then use a diff checker to compare changes in a readable format.